The condition in which two population of the same speices cannot breed with one another is called

Which plains area lies in both the united states and canada? altiplano central canadian shield coastal plains great plains

What are two reasons for why a species might disappear from the fossil record?

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h,o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.